a lot of heat will be dissipated by your 12 and 5 regulators considering that your 12 has to drop 12v and your 5 has to drop 7. ideally voltage drop should only in the range of 3v to 5v at most in order that regulation would be reliable and likewise the chip operates at a lower temperature.

the regulators should be installed with adequate heatsink size like a 1.5" (H) by 3" (W) by 1.5mm to 2mm (T)

a lot of heat will be dissipated by your 12 and 5 regulators considering that your 12 has to drop 12v and your 5 has to drop 7. ideally voltage drop should only in the range of 3v to 5v at most in order that regulation would be reliable and likewise the chip operates at a lower temperature.

the regulators should be installed with adequate heatsink size like a 1.5" (H) by 3" (W) by 1.5mm to 2mm (T)

[post=3296]Quoted post[/post]​

Click to expand...

Hi!

My circuit is similar to your the only diffent is that I use a switching power supply instead of a diode bridge.